Pioneer 7800 don't turn on.

[Ninja_Turtle 10+ year member]

My Head unit doesnt turn on. I connected everything accordingly. I checked all the fuses and all of them are intact. ANyone knows what can be wrong ??? and what I can do to see if my head unit still works.

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[Darren5531 10+ year member]

Take the power wire and the illumination wire and put them to your positive battery post then your ground wire to your negative. As long as your battery is 12-14v you are good. I just tested one of my head units this way.

 

[blue93corsica 10+ year member]

and by illumination he really meant accesory, easier way to test it, pull the plug out of the back of the HU, turn your key into the acc.position and break out the dmm and start probing primarily the constant, acc. and ground wire to make sure all your power is there

 

[jmanpc 5,000+ posts]

Yeah, definately whip out the DMM to make sure the unit is getting power. If it's getting power but not powering up, check the fuse on the unit itself. If the fuse is good, then your h/u may be screwed.